Sci Rep:全外显子组测序鉴定了非综合症听力损失患者KCNQ4中2个新的变异

2018-11-27 AlexYang MedSci原创

钾离子电压门控通道亚族Q成员4(KCNQ4)变异病因上与非综合征听力损失(耳聋非综合征常染色体显性2(DFNA2))有关。最近,有研究人员对98个患有听力损失的家庭进行了全外显子组测序。研究发现,在5个家庭中发现了KCNQ4变异,并鉴定了KCNQ4中的2个先的变异:一个错义变异(c.796G>T; p.Asp266Tyr)和一个结构缺失变异(c.259_267del; p.Val87_Asn

钾离子电压门控通道亚族Q成员4(KCNQ4)变异病因上与非综合征听力损失(耳聋非综合征常染色体显性2(DFNA2))有关。最近,有研究人员对98个患有听力损失的家庭进行了全外显子组测序。

研究发现,在5个家庭中发现了KCNQ4变异,并鉴定了KCNQ4中的2个先的变异:一个错义变异(c.796G>T; p.Asp266Tyr)和一个结构缺失变异(c.259_267del; p.Val87_Asn89del)。p.Asp266Tyr位于通道核心区域,并能够导致听力损失的早期起始和中度的听力损失,而p.Val87_Asn89del位于胞质区N末端,并能够导致听力损失的晚发和高频特异性听力损失。当研究人员将上述2种变异蛋白在HEK 293 T细胞中异源性表达时均没有表现出蛋白转运到质膜中的缺陷或者与野生型(WT)KCNQ4通道的互作。膜片钳技术分析阐释了p.Asp266Tyr和p.Val87_Asn89del变异通道丧失了导电性能并且对KCNQ激活子完全没有响应,比如硫氧吡啶锌和ML213等。另外,研究人员指出,WT-p.Asp266Tyr串联体组装的通道与WT-WT类似,能够展现正常的导电功能和对KCNQ激活子的响应,而WT-p.Val87_Asn89del串联体则表现出损伤的导电性能,表明了p.Val87_Asn89de能够引起完全的功能丧失,并且伴随对功能性WT通道的强烈负面影响。

最后,研究人员指出,主要的病理机制可能与钾离子通道活性的丧失有关,而不是在蛋白质膜泡运输上。

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    2018-11-29 ysjykql
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